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Wellbore-heat-transfer-model-based optimization and control for cooling downhole drilling fluid

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Petroleum Science 2024年第3期21卷 1955-1968页

作者： Chao Wang He Liu Guo-Wei Yu Chen Yu Xian-Ming Liu Peng Huang Yangtze University Jingzhou434023HubeiChina State Key Laboratory of Petroleum Resources and engineering China University of Petroleum(Beijing)Beijing2249China CNPC Bohai Drilling engineering Co. LtdTianjin300280China Exploration Development and Construction engineering division of Petrochina Jidong Oilfield company Tangshan63200HebeiChin Henan University of Urban Construction Pingdingshan467036HenanChina

To address the two critical issues of evaluating the necessity of implementing cooling techniques and achieving real-time temperature control of drilling fluids underground in the current drilling fluid cooling technology,we first established a temperature and pressure coupled downhole heat transfer model,which can be used in both water-based and oil-based drilling ***,fourteen factors,which could affect wellbore temperature,were *** on the standard deviation of the downhole temperature corresponding to each influencing factor,the influence of each factor was *** influencing factors that can be used to guide the drilling fluid's cooling technology were drilling fluid thermal conductivity,drilling fluid heat capacity,drilling fluid density,drill strings rotation speed,pump rate,viscosity,ROP,and injection *** nondominated sorting genetic algorithm was used to optimize these six parameters,but the optimization process took 182 *** these eight parameters'influence rules with the nondominated sorting genetic algorithm can reduce the optimization time to 108 ***,the downhole temperature has been demonstrated to increase with the inlet temperature increasing linearly under quasi-steady *** this law and PID,the downhole temperature can be controlled,which can reduce the energy for cooling the surface drilling fluid and can ensure the downhole temperature reaches the set value as soon as possible.

关键词： Drilling Cooling Influencing factors Analysis Optimization Control

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Three-Dimensional Multi-Phase Microscopic Simulation of Service Life of Recycled Large Aggregate Self-Compacting Concrete

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Journal of Materials Science and Chemical engineering 2024年第4期12卷 126-135页

作者： Jing Li Lina Gao Libo Liu Liao Zhang Jianhua Zheng Jing Gao College of Pipeline and Civil engineering China University of Petroleum (East China) Qingdao China china Huanqiu Contracting & engineering Co. Ltd. Beijing China School of Civil and Transportation engineering Beijing University of Civil Engineering and Architecture Beijing China The Fourth Construction Co. Ltd. of China Construction Eighth Engineering Division Qingdao China

Recycled large aggregate self-compacting concrete (RLA-SCC) within multiple weak areas. These weak areas have poor resistance to chloride ion erosion, which affects the service life of RLA-SCC in the marine environment. A three-dimensional multi-phase mesoscopic numerical model of RLA-SCC was established to simulate the chloride ions transportation in concrete. Experiments of RLA-SCC immersing in chloride solution were carried out to verify the simulation results. The effects of recycled large aggregate (RLA) content and RLA particle size on the service life of concrete were explored. The results indicate that the mesoscopic numerical simulation results are in good agreement with the experimental results. At the same depth, the closer to the surface of the RLA, the greater the chloride ion concentration. The service life of RLA-SCC in marine environment decreases with the increase of RLA content. Compared with the service life of 20% content, the service life of 25% and 30% content decreased by 20% and 42% respectively. Increasing the particle size of RLA can effectively improve the service life of RLA-SCC in chloride environment. Compared with the service life of 50 mm particle size, the service life of 70 mm and 90 mm increased by 61% and 163%, respectively. .

关键词： Recycled Large Aggregate Self-Compacting Concrete Mesoscopic Mode Chloride Ion Diffusion Numerical Analysis

Characteristics of proppant transport and placement within rough hydraulic fractures

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Petroleum Exploration and Development 2024年第2期51卷 453-463页

作者： HUANG Hai ZHENG Yong WANG Yi WANG Haizhu NI Jun WANG Bin YANG Bing ZHANG Wentong School of Petroleum engineering Xi’an Shiyou UniversityXi’an 710065China Shaanxi Key Laboratory of Carbon Dioxide Sequestration and Enhanced Oil Recovery Xi’an 710075China Shaanxi Provincial Key Laboratory of Oil and Gas Well and Reservoir Seepage and Rock Mechanics Xi’an 710065China Oil&Gas Field Production Construction division PetroChina Tarim Oilfield CompanyKorla 841000China National Key Laboratory of Petroleum Resources and engineering China University of Petroleum(Beijing)Beijing 102249China Shaanxi Yanchang Petroleum(Group)Co. Ltd.Xi’an 710075China

A three-dimensional reconstruction of rough fracture surfaces of hydraulically fractured rock outcrops is carried out by casting process,a large-scale experimental setup for visualizing rough fractures is built to perform proppant transport *** typical characteristics of proppant transport and placement in rough fractures and its intrinsic mechanisms are investigated,and the influences of fracture inclination,fracture width and fracturing fluid viscosity on proppant transport and placement in rough fractures are *** results show that the rough fractures cause variations in the shape of the flow channel and the fluid flow pattern,resulting in the bridging buildup during proppant transport to form unfilled zone,the emergence of multiple complex flow patterns such as channeling,reverse flow and bypassing of sand-carrying fluid,and the influence on the stability of the sand *** proppant has a higher placement rate in inclined rough fractures,with a maximum increase of 22.16 percentage points in the experiments compared to vertical fractures,but exhibits poor stability of the sand *** fracture width aggravates the bridging of proppant and induces higher pumping *** the viscosity of the fracturing fluid can weaken the proppant bridging phenomenon caused by the rough fractures.

关键词： reservoir fracturing rough fracture proppant transport and placement characteristics bridging buildup

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Co-occurrence of per-and polyfluoroalkyl substances, heavy metals and polycyclic aromatic hydrocarbons and their composite impacts on microbial consortium in soil: A field study

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Pedosphere 2024年第4期34卷 736-748页

作者： Meng ZHANG Qing WANG Xin SONG Mukhtiar ALI Zhiwen TANG Xin LIU Zhuanxia ZHANG Shurong MA Jinhui BI Zhongyuan LI Key Laboratory of Saline-Alkali Vegetation Ecology Restoration Northeast Forestry University Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences University of Chinese Academy of Sciences Center International Group Co. Ltd. china Construction eighth engineering division Corp. Ltd.

This is the first study to report the co-occurrence of per-and polyfluoroalkyl substances（PFASs）, heavy metals, and polycyclic aromatic hydrocarbons（PAHs） and their impacts on the native microbial consortium in soil due to the long-term exposure. The PFASs, heavy metals, and PAHs were detected in soil samples collected at 2–6 m below the ground surface at different sampling locations in a steel-making factory. The total concentrations of PFASs varied from 6.55 to 19.79 ng g-1, with perfluorooctane sulfonate（PFOS）, perfluorobutane sulfonate, and 6:2 chlorinated polyfluorinated ether sulfonate（alternative of PFOS） being the predominant PFASs. The concentrations of arsenic, cadmium, and lead were detected in the ranges of 4.40–1 270.00,0.01–8.67, and 18.00–647.00 mg kg-1, respectively, and the concentration of total PAHs was detected in the range of 1.02–131.60 mg kg-1. The long-term exposure to mixed contaminants of PFASs, heavy metals, and PAHs led to lower richness and diversity of microbial communities in soil. The soil bacterial communities were mainly composed of Pseudomonas, norank＿p＿GAL15, Leptothrix, norank＿o＿Rokubacteriales, and Acinetobacter. Correlations between soil environmental factors and microbial communities indicated that cation exchange capacity and total phosphorus were two key factors in shaping the composition of native microbial communities. Furthermore, Arthrobacter, Leptothrix, and Sphingobium were found to be significantly positively correlated with PFAS concentrations, indicating that these genera could tolerate the stress exerted by PFASs, along with the stress imposed due to the presence of heavy metals or/and PAHs.

关键词： arsenic cation exchange capacity mixed contaminant native microbial community perfluorooctane sulfonate total phosphorus

Low-carbon design towards sustainable city development: Integrating glass space with natural greenery

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Science china Technological Sciences 2024年第9期67卷 2659-2674页

作者： CAO Shi-Jie ZHANG CunKuan WANG JunQi FENG ZhuangBo CHEN Gang HAGHIGHAT Fariborz School of Architecture Southeast University Jiangsu Province engineering Research Center of Urban Heat and Pollution Control Southeast University Global Centre for Clean Air Research Department of Civil and Environmental EngineeringFaculty of Engineering and Physical SciencesUniversity of Surrey The Third Construction Co. Ltd. of China Construction Eighth Engineering Division Energy and Environment Group Department of BuildingCivil and Environmental EngineeringConcordia University

The rapid urban development has caused serious problems such as high energy consumption and carbon emissions, especially under the context of climate change. Buildings are particularly energy-intensive, generating about one third of global energyrelated carbon emissions. Compared with active solutions(like mechanical systems), passive solutions offer the potential to balance energy consumption, thermal comfort, and ecological benefits. One potential solution is the integration of green glass space(GGS) into passive building design. GGS is a transitional building space with glass curtain walls that exhibit excellent insulation performance during winter. However, GGS is susceptible to overheating during summer, which limits its ***, this work proposes a strategy of integrating vertical greenery into GGS, leveraging the nature-based solution of greenery(i.e., flourishes in summer and withers in winter) to address this seasonal challenge of GGS. The results demonstrated that the strategic application of vertical greenery can effectively mitigate the overheating in GGS and improve comprehensive benefits. By using full coverage of vertical greenery in a linear layout, the air temperature of GGS and cooling energy consumption were largely reduced by 8.02℃ and 12.2%, respectively, while the carbon abatement was enhanced by up to 101.11 tons. Based on a comprehensive evaluation of energy, economy, and environmental benefits, it is recommended to use a greenery configuration with 50% coverage in a vertical linear layout for GGS. The integration of greenery into building design can mitigate adverse environmental impacts, reduce energy consumption, and contribute to the sustainable development of low-carbon cities.

关键词： low-carbon design green glass space vertical greenery greenery configuration carbon abatement

Influence of Polyaluminum Chloride Residue on the Strength andMicrostructure of Cement-Based Materials

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Fluid Dynamics & Materials Processing 2024年第6期20卷 1299-1312页

作者： Ping Xu Zhiwei Zhang Zhenguo Hou Mankui Zheng Jin Tong School of Civil engineering Henan Polytechnic UniversityInternational Joint Research Laboratory of Henan Province for Underground Space Development and Disaster PreventionJiaozuo454003China china Construction Seventh engineering division Co. Ltd.Zhengzhou450004China china Construction Seventh engineering division Co. Ltd.General Contracting CompanyZhengzhou450004China

In this paper,cement and dechlorinated Polyaluminum Chloride Residue(PACR)have been used to prepare a net slurry and mortar *** hydration activity indicators have been used to quantitatively analyze the dechlorinated PACR hydration *** particular,the effect of dechlorinated PACR content on the compressive strength of mortar has been assessed by means of compressive strength ***,X-ray diffraction(XRD)and scanning electron microscopy(SEM)have been employed to observe the microstructure of the considered hydration *** following results have been *** 28th day activity index of the dechlorinated PACR is 75%,and therefore it meets the criterion for the use of active *** increase in the content of the dechlorinated PACR tends to reduce the compressive strength of mortar specimens,however,it is beneficial to its later strength *** the content is not greater than 10%,the strength remains unchanged,otherwise,it *** PACR does not form a new crystalline phase in the cement slurry,and the dechlorinated PACR remains active until the age of the 28th *** inclusion of the PACR mainly deteriorates the early strength of the cement slurry,but it promotes the production of hydration products in the cement slurry after the 7th day.

关键词： Dechlorinated polyaluminum chloride residue activity index strength microstructure hydration product

Novel pipe-roof method for a super shallow buried and large-span metro underground station

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Underground Space 2022年第1期7卷 134-150页

作者： Bo Lu Jiachao Dong Wen Zhao Xi Du Cheng Cheng Qian Bai Zhiguo Wang Mingcheng Zhao Jianyong Han School of Resources and Civil engineering Northeastern UniversityShenyang 110819China The School of Civil and Environmental engineering University of New South WalesSydney 2052Australia the first company of china eighth engineering division ltd Jinan 250014China School of Civil engineering Shandong Jianzhu UniversityJinan 250101China

To address the inadequacies of traditional pipe-roof methods,the steel support cutting pipe method(SSCP)—a novel pipe-roof method that improves construction security and underground space usage—is *** further explore the applications of SSCP,its design scheme ought to be *** failure mode and mechanical behaviors of the SSCP were investigated through laboratory ***,a series of finite element models(FEMs)was established to study the deformation ***,the parameters of the steel support of the proposed structure were optimized using fuzzy *** results indicated the ultimate bearing capacity to be 366.8 kN,and the specimen began to yield when the external load reached 70%of the ultimate *** lon-gitudinal spacing of the steel supports,transverse steel support size,and vertical steel support size had significant effect on the vertical deformation of the steel support and the ground ***,the optimal combination of steel supports for the SSCP structure was obtained.

关键词： Steel support cutting pipe method Ground settlement Deformation characteristics Fuzzy mathematical theory Parameter optimization

Preparation of a functional fracturing fluid with temperature-and salt-resistance,and low damage using a double crosslinking network

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Petroleum Science 2023年第5期20卷 3223-3230页

作者： Yang Zhang An Chen Jin-Cheng Mao Song-Hai Qin Jin Li Xiao-Jiang Yang Chong Lin Zhi-Yu Huang Ya-Fei Liu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan610500China Development division PetroChina Southwest Oil and Gas Field CompanyChengduSichuan610066China Downhole Services company CNPC Bohai Drilling Engineering Company LtdRenqiuHebei062550China Sinopec Zhongyuan Oilfield company PuyangHenan457001China

Fracturing fluids(FFs)have been widely used to stimulate the tight ***,current FFs will not only lose their rheological property at high temperatures and high salt but also show an incomplete gel-breaking ***,a double crosslinking network FF with pretty superiorities in rheology and low damage to the core was constructed by introducing both physical crosslinking and chemical crosslinking into the *** construction of double crosslinking networks enhanced the rheology of this functional *** particle sizes of gel-breaking fluids are mainly distributed in 1.0e10,000 nm;furthermore,for every 10,000 mg/L increase in salinity,the particle size of the gel-breaking fluid is decreased by almost *** adsorption capacity(first and then kept stable with temperature increasing at a salinity of ≤30,000 mg/L,however,showed the opposite trend at 40,000 mg/*** results of rheology,particle size,static adsorption,and core damage showed that this functional FF could be an alternative for the stimulation of a tight reservoir with high temperature and recycling of produced water with high salinity.

关键词： Fracturing fluid Temperature-and salt-resistance Particle size Static adsorption Low damage

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Investigation on the contact stress distribution of innovative self-propelled saddle in long-span suspension bridge

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Journal of Traffic and Transportation engineering(English Edition) 2023年

作者： Gang Liu Zhendong Qian Leilei Chen Xiangfei Zhang Daoxie Chen Intelligent Transport System Research Center， Southeast University china Construction eighth engineering division Co.， ltd.

In this paper， a main cable force self-propelled system， and its innovative self-propelled saddle with a row of rollers were presented. To ensure the service life and functionality of the self-propelled saddle structure， the newly designed saddle structure was taken as an example， and the contact stress distribution characteristics was clarified through the finite element model and verified through Hertz contact theory. Results show that the unevenness of the contact stress along the axial direction is relatively large， and the contact stress level of the side and middle rollers is much larger， which can be attributed to the fan-shaped structure in the upper part of the saddle structure， the thickness and angle setting of the ribs. Furthermore， specific optimization suggestions were given on structural modification and material use. The analysis process of contact stress and optimization suggestions could also provide useful guidance to the design and application of other self-propelled saddles， which is of great significance for the normal operation of long-span suspension bridges with innovative self-propelled saddle.

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